APA (7th ed.) Zitazioa
Thomas, S. (1980). The developed world. Bell & Hymn.
Chicago Style (17th ed.) Zitazioa
Thomas, Spencer. The Developed World. London: Bell & Hymn, 1980.
MLA (9th ed.) Zitazioa
Thomas, Spencer. The Developed World. Bell & Hymn, 1980.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.